How many muscles does it take to smile and to frown?

There are about 200 million to 300 million sperm cells are contained in an average human ejaculation. Yet sperm cells make up only 2 to 5 percent of total sperm volume. The rest is composed of fluids, known as seminal plasma, that help keep the sperm cells alive.

Point Barrow, a city in Alaska with a 1980 population of 2,207, mostly Eskimo. It was the site of the 1935 air crash that killed Will Rogers.

Actually called Newton’s law of gravitation, it describes the degree to which one body of matter attracts another. That attraction is in direct proportion to the product of the bodies’ masses, and in inverse proportion to the square of the distance between them. This law can be expressed in a formula first set forth in…

Shooting stars are not stars but meteorites, particles from space entering and burning up in the earth’s atmosphere.

Kurt Russell, with songs dubbed by Ronnie McDowell, played Elvis Presley in the TV movie “Elvis” (1979). The film was directed by John Carpenter.

Fingerprints provide traction for your fingers, helping you to grasp things.